teach pkg query about %Q

docs/pkg-query.8

@@ -128,6 +128,8 @@ as a dependency of another package, 0 otherwise.
 The package can be automatically removed via
 .Sq pkg autoremove
 when this flag is set and no other package depends on it.
+.It Cm \&%Q
+Alternative architecture of the matches package
 .It Cm \&%q
 Architecture of the matched package
 .It Cm \&%k

src/query.c

@@ -59,6 +59,7 @@ static struct query_flags accepted_query_flags[] = {
 	{ '?', "drCFODLUGBbA",	1, PKG_LOAD_BASIC },	/* dbflags handled in analyse_query_string() */
 	{ '#', "drCFODLUGBbA",	1, PKG_LOAD_BASIC },	/* dbflags handled in analyse_query_string() */
 	{ 's', "hb",		0, PKG_LOAD_BASIC },
+	{ 'Q', "",		0, PKG_LOAD_BASIC },
 	{ 'n', "",		0, PKG_LOAD_BASIC },
 	{ 'v', "",		0, PKG_LOAD_BASIC },
 	{ 'o', "",		0, PKG_LOAD_BASIC },
@@ -217,6 +218,9 @@ format_str(struct pkg *pkg, UT_string *dest, const char *qstr, const void *data)
 					break;
 				}
 				break;
+			case 'Q':
+				pkg_utstring_printf(dest, "%Q", pkg);
+				break;
 			case 'q':
 				pkg_utstring_printf(dest, "%q", pkg);
 				break;